ANALOG DEVICES AD4857 Buffered 8-Channel Simultaneous Sampling User Guide

User Guide
EVAL-AD4857
UG-2242

AD4857 Buffered 8-Channel Simultaneous Sampling

Evaluating the AD4857 Buffered, 8-Channel Simultaneous Sampling, 16-Bit 1 MSPS DAS

FEATURES

► Full featured evaluation board for the AD4857
► 8 input channels available through SMA connectors
► On-board reference circuit and power supplies
► Standalone capability through FMC connector and/or test points
► PC software for control and data analysis of the time and frequency domain
► ZedBoard-compatible
► Compatible with other FMC controller boards

EQUIPMENT NEEDED

► PC running Windows® 10 operating system or higher
► Digilent ZedBoard with 12 V wall adapter power supply
► Precision signal source
► SMA cables (inputs to evaluation board)
► USB cable

SOFTWARE NEEDED

► Analysis | Control | Evaluation (ACE) Software
► AD4857 ACE plugin from plug-in manager

EVALUATION BOARD KIT CONTENTS

► EVAL-AD4857FMCZ evaluation board
► Micro-SD memory card (with adapter) containing system board boot software and Linux OS

EVALUATION BOARD PHOTOGRAPH

GENERAL DESCRIPTION

The EVAL-AD4857FMCZ is designed to demonstrate the performance of the AD4857 and to provide access to many included configuration options that are accessed via a simple ACE plug-in graphical user interface (GUI). The AD4857 is a fully buffered, 8-channel simultaneous sampling, 16-bit, 1 MSPS data acquisition system (DAS) with differential, wide common-mode range inputs.
The EVAL-AD4857FMCZ on-board components include the following:
► The LTC6655 high precision, low drift, 4.096 V voltage reference (not used by default)
► The LT1761, low noise, 1.8 V, 2.5 V, and 5 V low dropout (LDO) regulators
► The LT8330 low quiescent current (I ) boost converter
For full details on the AD4857, see the AD4857 data sheet, which Q must be consulted in conjunction with this user guide when using the EVAL-AD4857FMCZ evaluation board.

REVISION HISTORY
6/2024—Revision 0: Initial Version
QUICK START GUIDE
Take the following steps to begin to evaluate the EVALAD4857FMCZ:

1. Download and install the ACE Software from the ACE web page. If ACE is already installed on the computer, ensure that the latest version is being used by clicking the Check For Updates icon in the ACE Software sidebar, as shown in Figure 2.
2. Run the ACE Software, select the Plug-in Manager from the ACE sidebar to install the board plug-in that supports the AD4857 evaluation board, and select Available Packages, as shown in Figure 3. You can use the search field to help filter the list of boards to find the AD4857 board. See the ACE Quickstart – Using ACE and Installing Plug-ins guide for additional information.
3. Insert the Micro-SD card (with the adapter) that was provided in the evaluation board kit into the SD card slot on the underside of the ZedBoard. If there is a requirement to reimage or create a new Micro-SD card, see the following instructions found on the Analog Devices, Inc., website: ADI Kuiper Linux with support for ACE Evaluation.
4. Ensure the ZedBoard boot configuration jumpers are set to use the Micro-SD card as shown in Figure 4. To avoid potential damage when JVIO is changed as described in Table 1, ensure that the VADJ SELECT jumper is set to the correct voltage for the EVAL-AD4857FMCZ.
5. Connect the EVAL-AD4857FMCZ to the FMC connector on the ZedBoard.
6. Connect the USB cable from the computer to the J13/USB OTG port, and connect the 12 V power supply to J20/DC input.
7. Slide the SW8/POWER switch in the ZedBoard to the on position. The green LD13/POWER LED turns on and is followed by the blue LD12/DONE LED (within the ZedBoard). The DS1  LED in the EVAL-AD4857FMCZ also turns on.
8. The red LD7 LED blinks approximately 20 sec to 30 sec later, indicating that the boot process is complete.
9. Launch the ACE Software from the Analog Devices folder in the Windows Start menu. The EVAL-AD4857FMCZ appears in the ACE Start in the Attached Hardware view, as shown in Figure 5.
   If the EVAL-AD4857FMCZ does not appear on the Attached Hardware view, the plug-in can still be launched from the Explore Without Hardware menu. Click Proceed To Documentation to open the plug-in documentation for troubleshooting help as well as descriptions of each window and features within the plug-in.

QUICK START GUIDE

EVALUATION BOARD HARDWARE

The AD4857 is a fully buffered, 8-channel simultaneous sampling, 16-bit 1 MSPS DAS with differential, wide common-mode range inputs. The AD4857 has an on- chip low drift 4.096 V internal voltage reference; however, it also optionally accepts an external reference applied through the REFIO pin and provided to the on-board LTC6655. The device operates from different power rails, provided through on-board LDO regulators as described in Power Supplies section. An option to connect external supplies exists and is explained in Table 1.

HARDWARE LINK OPTIONS
Table 1 details the link option functions and the default power link options. The EVAL-AD4857FMCZ can be powered from different sources, as described in the Power Supplies section. By default, the power supply required for the EVAL- AD4857FMCZ comes from the ZedBoard controller board. The power supply is regulated by the on-board regulators that generate the required bipolar supplies.

Table 1. Jumper Details with the Factory Default Settings

JODIFF to J7DIFF| Not inserted| Offset Calibration Jumper. Inserting the JODIFF to J7DIFF jumper link allows short circuiting the corresponding pair of inputs to measure the AD4857 offset and/or to perform an offset calibration.
---|---|---
J0+ to J7+| Not inserted| Analog Input to Ground Connection. Insert the J0+ to J7+ jumper link to connect to the AGND pin, the corresponding positive analog input.
J0− to J7−| Not inserted| Analog Input to Ground Connection. Insert the J0− to J7− jumper link to connect to the AGND pin, the corresponding negative analog input.
JV12V| A| The JV12V link selects the power supply source for the EVAL- AD4857FMCZ evaluation board.
In Position A, the unregulated supply to the on-board LDO regulators is taken from the ZedBoard 12 V supply.
In Position B, the unregulated external supply to the on-board LDO regulators is taken from the V12V_EXT connector.
JSHIFT| A| The JSHIFT link selects the power supply type for the AD4857. In Position A, the VCC pin = +24 V, and the VEE pin = −24 V.
In Position B, the VCCpin = +44 V, and the VEE pin = −4 V.
If not inserted, the VCC pin = +24 V, and the VEE pin = −4 V.
JVCC| A| The JVCC link selects the VCC pin supply source.
In Position A, the VCC pin is provided by the on board LT8330 DC/DC converter. In Position B, the VCC pin is provided though VCC_EXT connector.
JVEE| A| The JVEE link selects the VEE pin supply source.
In Position A, the VEE pin is provided by the on-board LT8330 DC/DC converter. In Position B, the VEE pin is provided though VEE_EXT connector.
JVDDH| A| The JVDDH link selects the VDDH pin supply source.
In Position A, the VDDH pin is provided by the on board LT1761 2.5 V LDO regulator. In Position B, the VDDH pin is provided though VDDH_EXT connector.
If not inserted, the VDDH pin can be tied to the AGND pin by inserting an R40 resistor. To disable the internal LDO regulator, tie the VDDH pin to the GND pin. With the regulator is disabled, connect the VDDL pin to an external supply in the range of 1.71 V to 1.89 V through the JVDDL link.
JVDD| A| The JVDD link selects the VDD pin supply source.
In Position A, the VDD pin is provided by the on-board LT1761 5 V LDO regulator. In Position B, the VDD pin is provided though VDD_EXT connector.
JVDDL| Not inserted| The JVDDL link selects the VDDL pin supply source.
In Position A, the VDDL pin is provided by the on-board LT1761 1.8 V LDO regulator. To use this configuration, tie the VDDH pin to ground through the JVDDH link.
In Position B, the VDDL pin is provided though the VDDL_EXT connector. To use this configuration, tie the VDDH pin to ground through the JVDDH link.
If not inserted, the internal LDO regulator is used for the JVDDH link to be in Position A or Position B.
JVIO| Not inserted| The JVIO link selects the VIO pin supply source. If not inserted, the VIO pin is taken from the ZedBoard (default). Alternatively, the VIO pin can be supplied from either the on-board LDO regulators or an external supply.
In Position A, the VIO pin is provided by the on-board LT1761 LDO regulator with an output voltage dependent on the JVIO_LDO link. The R66 resistor (shown in Figure 7) is unsoldered.
In Position B, the VIO pin is provided though the VIO_EXT connector. The R66 resistor is unsoldered.
Note the field programmable gate array (FPGA) image provided works at a 2.5 V digital level; therefore, use caution when changing the default position of the JVIO link jumper.
---|---|---
JVIO_LDO| Not inserted| The JVIO_LDO link selects the LT1761 LDO regulator output voltage when the JVIO link is in Position B. Inserted, the LT1761 output voltage is 3.3 V.
Not inserted, the LT1761 output voltage is 1.8 V.

CONNECTORS AND SOCKETS
The connectors and sockets on the EVAL-AD4857FMCZ are outlined in Table 2.
Table 2. On-Board Connectors

0 through Channel 7
SMA0− to SMA7−| Negative analog input SMA to Channel 0 through Channel 7
P1| FPGA mezzanine card (FMC) connector

POWER SUPPLIES
The ZedBoard supplies 12 V to power the rails for the different components on the EVAL-AD4857FMCZ. The AD4857 uses the following five power supply pins:
► Positive high voltage power supply (the VCCpin)
► Negative high voltage power supply (the VEEpin)
► Low voltage power supply (the VDDpin)
► 1.8 V power supply (the VDDLpin)
► Digital power supply (the VIOpin)

A combination of the LT8330 DC/DC converter and the LT1761 LDO regulator generate all the needed supply rails on the board.
Table 3. Default Power Supplies Available in the EVAL-AD4857FMCZ

REFERENCE CIRCUIT
By default, the AD4857 in the EVAL-AD4857FMCZ uses the internal low noise, low drift (10 ppm/°C maximum), temperature compensated band-gap reference that is factory trimmed to 4.096 V and the internal reference buffer.
As an optional alternative, an LTC6655 high precision, low drift (2 ppm/°C maximum), 4.096 V voltage reference is also provided. This external reference can be used in two different configurations, as explained in the AD4857 data sheet and as follows:
► External reference with internal buffer. For this configuration, connect the external reference to the REFIO pin and populate the R62 resistor shown in Figure 7.
► External reference with disabled internal buffer. For this configuration, connect the external reference to the REFBUF pin and populate the R46 resistor shown in Figure 7 and also connect the REFIO test point to ground.

EVALUATION BOARD SCHEMATICS AND ARTWORK

![ANALOG DEVICES AD4857 Buffered 8-Channel Simultaneous Sampling

• Power Solution Schematic](https://manuals.plus/wp-content/uploads/2024/07 /ANALOG-DEVICES-AD4857-Buffered-8-Channel-Simultaneous-Sampling-Power- Solution-Schematic.jpg)

ESD Caution
ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.
Legal Terms and Conditions
By using the evaluation board discussed herein (together with any tools, components documentation or support materials, the “Evaluation Board”), you are agreeing to be bound by the terms and conditions set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluation Board until you have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you (“Customer”) and Analog Devices, Inc. (“ADI”), with its principal place of business at Subject to the terms and conditions of the Agreement, ADI hereby grants to Customer a free, limited, personal, temporary, non-exclusive, non-sublicensable, non-transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY. Customer understands and agrees that the Evaluation Board is provided for the sole and exclusive purpose referenced above, and agrees not to use the Evaluation Board for any other purpose. Furthermore, the license granted is expressly made subject to the following additional limitations: Customer shall not (i) rent, lease, display, sell, transfer, assign, sublicense, or distribute the Evaluation Board; and (ii) permit any Third Party to access the Evaluation Board. As used herein, the term “Third Party” includes any entity other than ADI, Customer, their employees, affiliates and in-house consultants. The Evaluation Board is  NOT sold to Customer; all rights not expressly granted herein, including ownership of the Evaluation Board, are reserved by ADI. CONFIDENTIALITY. This Agreement and the Evaluation Board shall all be considered the confidential and proprietary information of ADI. Customer may not disclose or transfer any portion of the Evaluation Board to any other party for any reason. Upon discontinuation of use of the Evaluation Board or termination of this Agreement, Customer agrees to promptly return the Evaluation Board to ADI. ADDITIONAL RESTRICTIONS. Customer may not disassemble, decompile or reverse engineer chips on the Evaluation Board. Customer shall inform ADI of any occurred damages or any modifications or alterations it makes to the Evaluation Board, including but not limited to soldering or any other activity that affects the material content of the Evaluation Board. Modifications to the Evaluation Board must comply with applicable law, including but not limited to the RoHS Directive. TERMINATION. ADI may terminate this Agreement at any time upon giving written notice to Customer. Customer agrees to return to ADI the Evaluation Board at that time. LIMITATION OF LIABILITY. THE EVALUATION BOARD PROVIDED HEREUNDER IS PROVIDED “AS IS” AND ADI MAKES NO WARRANTIES OR REPRESENTATIONS OF ANY KIND WITH RESPECT TO IT. ADI SPECIFICALLY DISCLAIMS ANY REPRESENTATIONS, ENDORSEMENTS, GUARANTEES, OR WARRANTIES, EXPRESS OR IMPLIED, RELATED TO THE EVALUATION BOARD INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, TITLE, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS. IN NO EVENT WILL ADI AND ITS LICENSORS BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES RESULTING FROM CUSTOMER’S POSSESSION OR USE OF THE EVALUATION BOARD, INCLUDING BUT NOT LIMITED TO LOST PROFITS, DELAY COSTS, LABOR COSTS OR LOSS OF GOODWILL. ADI’S TOTAL LIABILITY FROM ANY AND ALL CAUSES SHALL BE LIMITED TO THE AMOUNT OF ONE HUNDRED US DOLLARS ($100.00). EXPORT. Customer agrees that it will not directly or indirectly export the Evaluation Board to another country, and that it will comply with all applicable United States federal laws and regulations relating to exports. GOVERNING LAW. This Agreement shall be governed by and construed in accordance with the substantive laws of the Commonwealth of Massachusetts (excluding conflict of law rules). Any legal action regarding this Agreement will be heard in the state or federal courts having jurisdiction in Suffolk County, Massachusetts, and Customer hereby submits to the personal jurisdiction and venue of such courts. The United Nations Convention on Contracts for the International Sale of Goods shall not apply to this Agreement and is expressly disclaimed.

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